[I] [Feature] How to obtain the pixel point at the center of the highest point of each grouping column [echarts]

[via GitHub]

rr210 opened a new issue, #19934:
URL: https://github.com/apache/echarts/issues/19934

   ### What problem does this feature solve?
   
   我想要拿到每一个分组柱状图的最高点的中心点, 打算拿graphic实现 现在拿不到每一组最高点的x,y的坐标像素点 想要加标签
   
   ### What does the proposed API look like?
   
   ```
   option = {
     tooltip: {
       trigger: 'axis',
       axisPointer: {
         type: 'shadow'
       }
     },
     legend: {},
     grid: {
       left: '3%',
       right: '4%',
       bottom: '3%',
       containLabel: true
     },
     xAxis: [
       {
           "type": "category",
           "position": "bottom",
           "data": [
               "Alipay+",
               "",
               ""
           ],
           "axisLabel": {
               "color": "#ffffff",
               "fontSize": 12,
               "lineHeight": 16
           }
       },
       {
           "type": "category",
           "position": "bottom",
           "data": [
               "",
               "WF",
               ""
           ],
           "axisLabel": {
               "color": "#ffffff",
               "fontSize": 12,
               "lineHeight": 16
           }
       },
       {
           "type": "category",
           "position": "bottom",
           "data": [
               "",
               "",
               "HK Biz"
           ],
           "axisLabel": {
               "color": "#ffffff",
               "fontSize": 12,
               "lineHeight": 16
           }
       }
   ],
     yAxis: [
       {
         type: 'value'
       }
     ],
     series:[
       {
           "name": "USD",
           "type": "bar",
           "barWidth": 22,
           "xAxisIndex": 0,
           "data": [
               1000000000015.99
           ]
       },
       {
           "name": "USD",
           "type": "bar",
           "barWidth": 22,
           "xAxisIndex": 1,
           "data": [
               "",
               999999999999.99
           ]
       },
       {
           "name": "USD",
           "type": "bar",
           "barWidth": 22,
           "xAxisIndex": 2,
           "data": [
               "",
               "",
               999999999999.99
           ]
       },
       {
           "name": "EUR",
           "type": "bar",
           "barWidth": 22,
           "xAxisIndex": 0,
           "data": [
               1080699999999.91
           ]
       },
       {
           "name": "CNY",
           "type": "bar",
           "barWidth": 22,
           "xAxisIndex": 1,
           "data": [
               "",
               1408400000000
           ]
       },
       {
           "name": "CNY",
           "type": "bar",
           "barWidth": 22,
           "xAxisIndex": 2,
           "data": [
               "",
               "",
               1408400000000
           ]
       },
       {
           "name": "Others(US $)",
           "type": "bar",
           "barWidth": 22,
           "xAxisIndex": 1,
           "data": [
               "",
               2115000000000
           ]
       }
   ]
   };
   ```


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